Gas furnace and stove.



W. L. MERSFELDER.

GAS FURNACE AND STOVE,

APPLICATION FILED FEB-5,1916.

Patented July 2 1 1917.

2 SHEETSTSHEET I.

UUUUUUU IUNI'TED %TATE% FANT FFI@i WILLIAM L. MERSFELDER, OF KENNEDY HEIGHTS, OHIO.

GAS FURNACE AND STOVE.

Application filed February 5, 1916.

To all whom it may concern:

Be it known that I, IVILLIAM L. MunsrnLDnR, a citizen of the United States, and a resident of Kennedy Heights, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Gas Furnaces and Stoves, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

My invention relates to gas installation for stoves, ranges and furnaces which burn coal also. There has been great difficulty in providing a removable gas burner for coal stoves or furnaces, which will be effective and will not have to be removed from the stove or furnace when it is desired to burn coal.

The necessity for such a burner is great, because naturally gas supply, which is largely used for such purposes, is likely to be fluctuating and at times entirely out off, particularly from commercial users.

The object of this invention is to provide a gas burning device which can be used in a coal furnace or oven and does not have to be removed in order to be out of the way when the oven or furnace is used for coal.

This object and other advantages to be hereinafter noted I accomplish by that certain construction and arrangement of parts to be hereinafter more specifically pointed out and claimed, wherein the oven or furnace door is mounted or pivoted on the gas burner itself, thereby permitting the easy accessibility of the burner for use or its attachment to the stove, range or furnace door, and in the case of a coal range, whereby coal may be used in the winter when heating of the kitchen is desired, and the gas used in the summer, or at any other times, when convenient.

In the drawings,

Figure 1 is a front elevation of my invention as applied to a cook stove or range, partly broken away to show the dampers.

Fig. 2 is a central vertical section of the device.

Fig. 3 is a detail section of the right hand mounting plate.

Fig. 4: is a central longitudinal section of the door and gas burner.

Fig. 5 is a front elevation of the invention in a furnace door,

Specification of Letters Patent.

Patented July 24L, 191?.

Serial No. 76,310.

Fig. 6 is a central vertical section thereof.

Fig. 7 is a detail of the plate lug construction.

Fig. 8 is a detail elevation of the mixer.

Fig. 9 is a side elevation of the right hand mounting plate.

In the development of my invention, it will be apparent that I have employed the oven or furnace door as the means for providing draft or air for combustion, and that all the new parts in the gas burning device comprise a new door and a gas burner, and plates to form the door hinge on the burner. In a cooking stove I also provide a false oven bottom to be used with gas, same to be removed from the oven at other times. In view of the fact that there are usually horizontally hinged doors in cooking stoves and vertically hinged ones in furnaces and the like, I provide two modifications of door and burner fitted to the two varieties of use. It should be understood, however, that these forms are merely the preferred forms illustrating the spirit of my invention as set forth in the appended claims, and that by describing two modifications I do not wish it to be construed that I thereby limit myself to these special modifications only.

In the cooking stove there is the usual oven 1, which is so mounted in the stove body 2 that there is a flue space 3 over the top of said oven. The oven has a base 4: and sides 5. For the use of the oven with gas I propose to mount in said oven, over the space where the gas burner is to be, a false bottom 6 which is merely set in place on suitable side flanges (not shown) and said false botton is of less depth than the oven itself, or cut away at the back from the middle portion to the sides, so as to leave .a passage for the heated products of combustion up from beneath the said false bottom into the oven itself at the back.

The door has an outer lining 7 and an inner lining 8 and some sort of non-heat conducting handle (not shown). Between the outer and inner linings is a chamber or down flue for the passage of heated air and fumes, which opens into the oven at 9 and opens at 10 into the flue space 3 at the top of the oven. If desired, a. flue plate 11 may be mounted around the opening at 10 into the space 3 to increase and enhance the circulation.

An ordinary slide damper 12 is mounted over the opening at 9 into the oven and the inner lining forming the above described flue passage terminates at 13 at about the height of the false oven bottom so as to leave a space beneath said inner lining for the reception of the gas burner.

A segmental projection 14 at the left bot tom corner of the door fits over a lug 15 on the stove body and a plate 16 is screwed to the body over the top of the projection 14: to form a hinge forthe door at the left. The burner comprises a U-shaped section of pipe forming the lower burner 17 and the upper burner 18, the same being connected at the left hand end. A slanting portion 19 of pipe extends down from the right hand end of the lower burner and is suitably connected to the mixer tube 20.

-.The furnace .door is hinged over the pipe 19 where it turns to be connected to the mixer and for. this purpose there is provided a' like segmental projection 21 on the door which is held over the pipe by means of the inner end of a plate 22 that extends part way up the side of the stove body along the door opening. This projection 21 has a spring crank 23 which is concealed by the plate 22 and connected to this crank is the counterbalanc'ing spring 24'. This spring passes up beneaththe plate 22 and is secured to a bolt plate.

The lower portion of the door beneath the end of the inner lining has an opening 26 25 orthe likenear the top of the which is provided with a slide damper 27.

The slide damper 27 and the like damper 12 for the innerlining, whichhas already been described, are interconnected by arms 28, 28. The two dampers are shifted together by a sliding lug 29 which projects out through a slot 30 inthe lower damper plate.

Theilug 29 is mounted on a plate 30 which isitselfmounted slid ably on the upper pipe of the gas burner. This plate serves as a locking device to secure the burner either to :the door or to the bodyof the stove. When the burner'is secured to the door, it can swing downwith it as the burner pipe 19is thediinge bearing of the door and the Ipipeand door are bothheld-in place by the plates 22 and'16. Thusthe oven may be usedto its full depth when coal is being used and thejb'urner will never be in the way ofthe user'. i

The plate also serves to lock the burner to the steve body, and in this instance the burner may-be'used for gas and the door swung down to open position without disturbing the position of the burner in any way. -.:Furthermore.the fact that the lug for opening and closing the dampers is-on the locking plate brings it about thatwhen the plate and burner are locked to-tlie door then the dampers are closed, and when theburner islocked to the stove body, the lower and upper dampers are both open, thus admitting air below to the burners and at the same time opening the flue passage in the door for the escape of fumes.

The slidable mountingof the lock plate is accomplished by screws 30 in the upper burner pipe and slots in the lock plate to receive them. The lock plate has an extension 31 at the right hand which fits under a suitable notch 32 in the plate 22, and at the left hand end it has an extension 33 which slides under a lug 34 on the door inner lining.- The left movement of the dampers closes them and the right movement opens them, and in corresponding manner the left movement of the sliding lock plate fastens the burners to the door and the right movement fastens them to the stove body.

Thus it can be seen that by the provision of the new door and the new burner, any stove may be permanently fitted to burn gas, and converted to a coal stove by the mere shifting of the lug abovementioned.

For a gas and air mixer,lprovide a simple and "effective air control which -further saves expense inthe cost of installation of my invention. Near the expanded end .35 of the mixer pipe is formeda lug or plate holder 36. On this lug slides an arm '37 which carries the circular plate 38 that closes the end ofthe mixer pipe. .The slidable mount for the arm is preferablya screw 39' and slot 40, but some other means could easily be devised. In adjusting the plate 38 near or removed from the end of the mixer pipe, it is necessary to loosen the screw and tighten the samewhen the plate is in proper position. The gas enters from the supply pipe 41 through an opening 42in the mixer closing plate 38.

As was stated above, theburner may be extensions 45 which fit over the vertical pipe andthe plates 46 screwedto the side of the furnace door serve to hold thesaid extensions in place over the pipethereby providing a hinge for the door. The door'has suitable slots in it,.the same closed;by a sliding damper plate {l7 as in the :former case to supply airto the burners. There is no need for the inner lining of the,flue chamberin the door as in the case of the stove, because the gas is' burntinthegfirepot of thefurnace instead of in an oven as in thecook stove.

There is a vertical lock bar 4:8..slidably mounted on brackets or -arms lfiontheupper andlower of the three burner pipes. This bar has an extension 50 which ga es through a slot 51 in the bottom of the furnace door, and its upper end 52 engages under a suitable plate 53 on the outside body of the furnace just above the door. The door has a slot for the bar to pass through so as to engage this plate.

A lug 54 on the bar extends out through the door and is used to operate the bar and the bar has a stud 56 thereon which engages in a slanting slot 56 formed in an ear 57 on the damper plate.

It is thus obvious that when the furnace is to be used for gas, all that is necessary is to operate the lug 54c, whereupon the gas burner will be locked to the furnace by the bar engaging in the slot above the top of said door. The damper will then be open to provide air for the burning gas and the gas may be used to supply fuel for the purpose. When the gas supply cannot be used, then the shifting of the lug in the opposite direction will cause the damper to be closed and the burners to swing out with the door. In either case the door is free to swing, the only difference being that when coal is used the burner moves out of the way with the door so as to be no interference to the stoker.

The operation of both devices is on the same principle as is now clearly explained and this principle is the essential spirit of my invention.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In a gas burning attachment for stoves, a stove having a door, a gas pipe, a burner thereon, a portion of said door forming a housing over the gas pipe whereby said door will swing over the pipe as a journal and whereby the housing on the door will support the pipe, and air openings in the door for the burner.

2. In a gas burning attachment for stoves, a stove having a door, a gas pipe, means on the door to engage over the gas pipe, and means on the stove for holding the pipe and the burner together thereon, thereby forming a hinge for the door and a revoluble sup port for the pipe, means for securing the burner to the door, and draft openings in the door for the burner.

3. In a gas burning attachment for stoves, a door, a gas pipe, a burner thereon, and means for hinging said door over the pipe, a damper in said door adjacent the burner, a securing means to hold the burner to the door, and means for operatively connecting the damper and securing means so that the closing of the damper will operate said securlng means.

4. In a gas burning attachment for stoves, a door, a gas pipe, a burner thereon, and means for hinging said door over the pipe, said burner having a means for securin 0 same to the door and to the stove. a

ing ovens and the like, a gas 'pipe, a burner thereon, a false oven bottom located above the burner, a door forming a housing for the burner and hinged over the gas pipe.

6. In a gas burning attachment for cooking ovens and the like, having flue space over the top thereof, a gas burner, a false bottom for the oven located above the burner and provided with an opening therefor, a draft opening in the door below the false bottom, a flue chamber in the door, and a passageway from said chamber to the flue space over the oven.

7. In a gas burning attachment for cooking ovens and the like, having flue space over the top thereof, a gas burner, a false bottom for the oven located above the burner and provided with an opening therefor, a door, a flue chamber in the door, and a passageway from said chamber to the flue space over the oven, dampers in said door, one adjacent to the burner below said false bottom, and one on the inside of the flue chamber of said door.

8. In a gas burning attachment for cooking ovens and the like, having flue space over the top thereof, a gas burner, a false bottom for the oven located above the burner and provided with an opening therefor, a door, a flue chamber in the door, and a passageway from said chamber to the flue space over the oven, dampers in said door, one adjacent to the burner below said false bottom, and one on the inside of the flue chamber of said door, said dampers operatively connected so as to operate in unison.

9. In a gas burning attachment for cooking ovens and the like, a gas pipe, a burner thereon, a false oven bottom located above the burner, and means for hinging the door over the gas pipe, said burner being housed in the door, and means for securing the gas burner to the oven door, and draft openings in the door for the burner.

10. In a gas burning attachment for cooking ovens and the like, a gas pipe, a burner thereon, a false oven bottom located above the burner, a door, means for hinging the door over the oven and means for mounting the burner so as to swing with the door, said gas burner having means for securing same to the oven door and to the stove.

11. In a gas burning attachment for cooking ovens and the like, having flue space over the top thereof, a gas burner, a false bottom for the oven located above the burner and provided with an opening therefor, a door, a flue chamber in the door, and a passageway from said chamber to the flue space over the oven, a gas pipe for said burner, means for hinging the door over the oven and means for mounting said burner so as to swing with the door, a damper from the flue chamber to the interior of the oven, means 5. In a gas burning attachment for cookfor locking the burner to the door, and operative connection between said damper and the locking means.

12. In a gas burning attachment for cooking ovens and the like, having flue space over the top thereof, a gas burner, a false bottom for the oven located above the burner and provided with an opening therefor, a door, a flue chamber in the door, and a passageway from said chamber to the flue space over the oven, dampers in said door, one adjacent to the burner below said false bottom, and one on the inside of the flue chamber of said door, a gas pipe for said burner, means for hinging the door over the oven and means for mounting said burner so as to swing with the door, means for locking the burner to the door, and operative connection between the dampers and the locking means.

13. In a gas burning attachment for stoves or the like, a door, a burner movably mounted with relation to the stove, means for coupling the burner to the door so as to move therewith, and means for coupling the burner to the stove so as to be free of the door.

14. In a gas burning attachment for stoves or the like, a door, means for mounting the door so as to swing on the stove body, a burner, said door being formed for completely receiving and housing the burner so that the burner lies substantially within the inner surface of the door, said burner being mounted so as to swing with the door.

WILLIAM L. MERSFELDER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

